city_f.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>演示：移动端按首字母检索城市列表</title>
<link rel="stylesheet" href="../../assets/css/reset.css">
<link rel="stylesheet" type="text/css" href="../../assets/css/city.css">
</head>
<body>
<div class="city">
<div class="city-wrapper city-wrapper-hook">
<div class="scroller-hook">
<div class="cities cities-hook"></div>
</div>
<div class="shortcut shortcut-hook"></div>
</div>
</div>
<script src="../../assets/js/bscroll.min.js"></script>
<script src="../../assets/js/city.js"></script>
<script>
var cityWrapper = document.querySelector('.city-wrapper-hook');
var cityScroller = document.querySelector('.scroller-hook');
var cities = document.querySelector('.cities-hook');
var shortcut = document.querySelector('.shortcut-hook');
var scroll;
var shortcutList = [];
var anchorMap = {};
function initCities() {
var y = 0;
var titleHeight = 28;
var itemHeight = 44;
var lists = '';
var en = '<ul>';
cityData.forEach(function (group) {
var name = group.name;
lists += '<div class="title">'+name+'</div>';
lists += '<ul>';
group.cities.forEach(function(g) {
lists += '<li class="item" data-name="'+ g.name +'" data-id="'+ g.cityid +'"><span class="border-1px name">'+ g.name +'</span></li>';
});
lists += '</ul>';
var name = group.name.substr(0, 1);
en += '<li data-anchor="'+name+'" class="item">'+name+'</li>';
var len = group.cities.length;
anchorMap[name] = y;
y -= titleHeight + len * itemHeight;
});
en += '</ul>';
cities.innerHTML = lists;
shortcut.innerHTML = en;
shortcut.style.top = (cityWrapper.clientHeight - shortcut.clientHeight) / 2 + 'px';
scroll = new window.BScroll(cityWrapper, {
probeType: 3
});
// scroll.on('scroll', function (pos) {
// console.log(Math.round(pos.y));
// });
scroll.scrollTo(0, 0);
}
//bind Event
function bindEvent() {
var touch = {};
var firstTouch;
shortcut.addEventListener('touchstart', function (e) {
var anchor = e.target.getAttribute('data-anchor');
firstTouch = e.touches[0];
touch.y1 = firstTouch.pageY;
touch.anchor = anchor;
scrollTo(anchor);
});
shortcut.addEventListener('touchmove', function (e) {
firstTouch = e.touches[0];
touch.y2 = firstTouch.pageY;
var anchorHeight = 16;
var delta = (touch.y2 - touch.y1) / anchorHeight | 0;
var anchor = shortcutList[shortcutList.indexOf(touch.anchor) + delta];
scrollTo(anchor);
e.preventDefault();
e.stopPropagation();
});
function scrollTo(anchor) {
var maxScrollY = cityWrapper.clientHeight - cityScroller.clientHeight;
var y = Math.min(0, Math.max(maxScrollY, anchorMap[anchor]));
if (typeof y !== 'undefined') {
scroll.scrollTo(0, y);
}
}
}
initCities();
bindEvent();
</script>
</body>
</html>